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Reintroduce Secondary TT Aging

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Restricted secondary aging in TT to evict stale high-depth entries that could not cutoff.

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 189792 W: 48752 L: 48702 D: 92338
Ptnml(0-2): 428, 21147, 51711, 21167, 443
https://tests.stockfishchess.org/tests/view/69fae7b6c91f9625ce3253c8

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 234792 W: 59743 L: 59741 D: 115308
Ptnml(0-2): 98, 24714, 67772, 24712, 100
https://tests.stockfishchess.org/tests/view/69ff3aa39392f0c317213e31

See #6742 for information and test results
```
Using ./stockfish_fix1 on KRvK_1000pv.epd with --nodes 1000000 --mate 0
Engine ID:     Stockfish dev-20260505-1429d98e
Total FENs:    1000
Found mates:   620
Best mates:    159

Using ./stockfish_fix1 on KRvK_1000pv.epd with --nodes 10000000 --mate 0
Engine ID:     Stockfish dev-20260505-1429d98e
Total FENs:    1000
Found mates:   1000
Best mates:    709
```

Closes #6576
Closes #6742

closes https://github.com/official-stockfish/Stockfish/pull/6818

Bench: 2821162
This commit is contained in:
Shawn Xu
2026-05-17 20:46:31 +02:00
committed by Joost VandeVondele
parent 57f3a2bfbe
commit 94beadffb3
1 changed files with 6 additions and 0 deletions
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src/tt.cpp
+6
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@@ -107,6 +107,12 @@ void TTEntry::save(
value16 = int16_t(v);
eval16 = int16_t(ev);
}
// Secondary aging. Important for elementary mate finding.
// (*Scaler) Secondary aging on entries relevant to singular extensions
// generally scales poorly and requires VVLTC verification.
else if (depth8 + DEPTH_NONE >= 5 && is_decisive(value16)
&& Bound((genBound8 & BOUND_MASK) >> BOUND_SHIFT) != BOUND_EXACT)
depth8--;
}